Add AI-powered nutrition and plan modules

Introduces DSPy-based nutrition and plan generation modules, including image analysis for nutritional info and personalized diet/exercise plans. Adds new API endpoints for health metrics/goals, nutrition image analysis, and plan management. Updates models, schemas, and backend structure to support these features, and includes initial training data and configuration for prompt optimization.

backend/app/api/v1/endpoints/nutrition.py

@@ -1,21 +1,21 @@
+import litellm
+import dspy
 from typing import Any
-from fastapi import APIRouter, Depends, HTTPException
+
+from fastapi import APIRouter, Depends, File, Form, HTTPException, UploadFile
 from pydantic import BaseModel
 from sqlmodel import Session
+
+from app.ai.nutrition import NutritionalInfo, analyze_nutrition_from_image, nutrition_module
 from app.api import deps
-from app.ai.nutrition import nutrition_module, NutritionalInfo
-from app.core.security import create_access_token # Just ensuring we have auth imports if needed later
-from app.models.user import User
+from app.models.food import FoodLog  # Added FoodItem
 
 router = APIRouter()
 
+
 class AnalyzeRequest(BaseModel):
     description: str
 
-from app.models.food import FoodLog, FoodItem
-from app.api.deps import get_session
-from app.core.security import get_password_hash # Not needed
-from app.config import settings
 
 @router.post("/analyze", response_model=NutritionalInfo)
 def analyze_food(
@@ -30,6 +30,24 @@ def analyze_food(
     except Exception as e:
         raise HTTPException(status_code=500, detail=str(e))
 
+
+@router.post("/analyze/image", response_model=NutritionalInfo)
+async def analyze_food_image(
+    file: UploadFile = File(...),
+    description: str = Form(""),
+) -> Any:
+    """
+    Analyze food image and return nutritional info.
+    """
+    try:
+        contents = await file.read()
+        return analyze_nutrition_from_image(contents, description)
+    except litellm.exceptions.BadRequestError as e:
+        raise HTTPException(status_code=400, detail=f"Invalid image or request: {str(e)}")
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=str(e))
+
+
 @router.post("/log", response_model=FoodLog)
 def log_food(
     *,